There was a tip posted years ago that the starter motor could be separated from the starter gearbox while mounted to the engine. The motor is then removed, followed by the gearbox. I have not tried it.
Anyone successful with this?
If you mean "make it easier" by taking the cover off the starter while the starter
is still mounted, that would be a hard NO for me. Its got all those springy things
inside holding the brushes or something and when you slip the cover off it goes
SPROING and then if you can find all the things that sproinged away you need 16
fingers to hold the springy retainer things in and try to put the cover back on.
If you mean something else, then ida know...

Here's another starter thing: find a low profile wrench (maybe in the OEM tool kit)
and hold the bottom lock nut when you're loosening the hot wire from the starter.
Don't just turn the top one and hope it comes loose. The "stud" is just a bolt and
its head is held inside in a plastic thing that you could break.
-Mike